How to manage when your sister is pregnant at the same time as you: Kardashian-Jenner edition

Three out of the five Kardashian-Jenner sisters are expecting babies early next year. (Charley Gallay/Getty Images for Kardashian/Jenn)

Three out of the five Kardashian-Jenner sisters are expecting babies early next year.

Female best friends grow up planning their families together — how their husbands will be close, their neighboring homes will share white picket fences and, if all goes as planned, they'll get pregnant at the same time and their kids will grow up as besties, too.

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But the same might not as easily be shared among sisters — women who already grew up sharing everything in their lives. Enter the Kardashian-Jenner sisters, a clan so close that they share a "momager" — their mother/manager, Kris Jenner — various TV shows and countless magazine spreads.

And now, three of them will be sharing — and perhaps competing for — the celebrity pregnancy spotlight as well.

"There's always going to be a sibling rivalry and competition in siblings in all different ways — there's truth in that and it'll be there through a shared pregnancy as well," NYU Langone Health reproductive psychiatrist Marra Ackerman told the Daily News. "Siblings compete professionally and in their relationships and a pregnancy can bring that out: how you look while pregnant compared to your sister, your parenting styles later on, choosing to breast feed. Choices and supporting one another can be really nice things to share, but there can also be friction from making different decisions."

Kylie Jenner is about five months pregnant, TMZ reported, while confirming that she and her boyfriend, rapper Travis Scott, 25, are expecting a girl. (Bob Levey/Getty Images)

Kylie Jenner is about five months pregnant, TMZ reported, while confirming that she and her boyfriend, rapper Travis Scott, 25, are expecting a girl.

Jenner's half-sister, Khloe Kardashian, 33, is allegedly expecting a child as well. Us Weekly reported just days after Jenner's news broke that Kardashian and boyfriend Tristan Thompson, the 26-year-old forward for the Cleveland Cavaliers, are about four months pregnant.

Kim Kardashian, Jenner's and Khloe Kardashian's older sister, is also expecting. Kim Kardashian, 36, and husband Kanye West, 40, are having a third child via surrogate. They're reportedly expecting a mid-January due date.

If the reported timelines of each sister's pregnancy are correct, the three cousins would all be born within weeks of each other, but any speculation that the women cooked up a plan to have kids together is likely unrealistic.

"Logistically, in terms of conception, it varies between individuals," Ackerman told The News. "It would be very difficult to conceive at the same time and is definitely more by chance. It's painted in books and in movies that you have sex one time and you're pregnant, but I've seen a bit of infertility in my own patients and you can't always plan because it could take months or years (to get pregnant). The likelihood (of a three-way planned conception) is probably slim."

As the sisters likely know from growing up in a seemingly tight-knit family, kids who spend a lot of time together often share milestones and attention as well. The same could probably be said about cousins who spend a lot of family time together, too.

"There can be a nice closeness — similar to twins — between cousins who are born close together and live close by," Ackerman said. "They can take on a similar identity as twins with everything shared like joint birthday parties and conversations about (them) together instead of as individuals.

"It's the same with mothers," Ackerman continued. "Depending on their (parenting) decisions — their choices on when to return to work, for example, and how the rest of the family reacts, do they endorse one over the other — some sisters could get closer over this very big shared experience or one could potentially outdo the other."

It will be the first child for Jenner, the youngest daughter of Kris Jenner, and the first for Khloe, too. Kim and Kanye have two kids already: 4-year-old North and 1-year-old Saint. Their brother, Rob Kardashian, welcomed his first child with ex-fiancé Blac Chyna last November.